Which OSI layer handles routing and logical addressing for packets across multiple networks?

• A. Data Link Layer
• B. Network Layer
• C. Transport Layer
• D. Application Layer

Answer: (B)

Routing and logical addressing for packets across multiple networks are handled by the Network Layer. This layer assigns logical addresses (like IP addresses) that identify endpoints across diverse networks and uses routers to forward packets toward their destination. It chooses paths using routing tables and protocols, enabling inter-network communication and scalable reach beyond a single local network.

The Data Link Layer takes care of local delivery within a single network, using hardware addresses (MAC addresses) and does not route packets between different networks. The Transport Layer focuses on end-to-end communication, reliability, and flow control between hosts, not on routing across networks. The Application Layer provides user-facing services and applications, not network-wide routing.